[settings] changed debug knobs category to allow per-game usage (#3564)

as the name says, plus changed android type for shortsetting, and added communication good pratices to handbook (.md) file.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3564
Reviewed-by: DraVee <dravee@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Co-authored-by: xbzk <xbzk@eden-emu.dev>
Co-committed-by: xbzk <xbzk@eden-emu.dev>

src/common/settings.h

@@ -791,7 +791,7 @@ struct Values {
                                            0,
                                            65535,
                                            "debug_knobs",
-                                           Category::Debugging,
+                                           Category::Core,
                                            Specialization::Countable,
                                            true,
                                            true};